@Saudajuned71 welcome to the community and thanks for posting, I'm really sorry that you can't receive calls after moving to BT. When you transferred to BT did you keep the same number that you had when you were with Vodafone?
Hi @Saudajuned71 and welcome to the community.
Thanks for posting about your problem. I'm sure we'll be able to hep. As you've kept the number it may well be a porting problem as mentioned by @Starwire . I'll be happy to take a look at this for you. I've sent you a Private message explaining how you can contact the forum moderation team.
Check here: https://community.bt.com/t5/notes/privatenotespage